hey Minho Lee!
I am right from the area you are looking to relocate with the wife. 500k for a single family home is definitely not a super hard task in these areas. especially with that 100k down payments. Have you by any chance looked into some first time home buyer loans or even just lower down payments options so that you can leverage more of your money into investments?
With your left over cash I would look into... using the BRRRR method. The BRRRR method is great because once your done with 1 deal you can continue to recycle that into other BRRRS. with the capital you have I would assume you can do a couple BRRRS to start. Another option I would look at in the Worcester area is maybe a multi family or a rent by the room house situation that you can do mid term rentals out of. Worcester has many hospitals and an airport making it a great spot for mid term rentals.
Cash flow is definitely a hard thing to come across in the short term of things especially in nowadays market. so, just remember your other benefits to investing like appreciation, equity build, etc..
I am an investor friendly agent right in the area so ever need any help feel free to reach out my man!!